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题库 / Prep2007E1-CR-16
Most of the world's supply of uranium currently comes from mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.
Which of the following would it be most useful to determine in evaluating the argument?
Whether the uranium in deposits on land is rapidly being depleted
Whether most uranium is used near where it is mined
Whether there are any technological advances that show promise of reducing the cost of extracting uranium from seawater
Whether the total amount of uranium in seawater is significantly greater than the total amount of uranium on land
Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater
错选C。
因果。
前提：海洋开采的成本比目前的市场价格高
结论：如果不降低成本，海洋开采很难商业化
A选项直接评估了原文推理，如果陆地存量枯竭了，无论海洋开采成本降低与否，其都会商业化。
C说的是：是否有技术进步让我们看到了降低成本的希望。与原文推理无关。
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